Limitations of previous research
 Notable
limitations have characterized previous scientific studies. The
methods have been highly varied across studies and frequently non-optimal.
The patient samples investigated with sophisticated techniques have
been small and selected with diverse criteria.
Researchers have generally tended to study
only one phenomenon at a time, thus limiting the possibility of
understanding the relationships among the phenomena and their relevance
for the development and possible treatment or prevention of schizophrenia.
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